FM25V02 データシートの表示（PDF） - Ramtron International Corporation

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FM25V02

256Kb Serial 3V F-RAM Memory

Ramtron International Corporation 

System Hookup

The SPI interface uses a total of four pins: clock,

data-in, data-out, and chip select. A typical system

configuration uses one or more FM25V02 devices

with a microcontroller that has a dedicated SPI port,

as Figure 3 illustrates. Note that the clock, data-in,

and data-out pins are common among all devices.

The Chip Select and Hold pins must be driven

separately for each FM25V02 device.

FM25V02 - 256Kb SPI FRAM

For a microcontroller that has no dedicated SPI bus, a

general purpose port may be used. To reduce

hardware resources on the controller, it is possible to

connect the two data pins together and tie off the

Hold pin. Figure 4 shows a configuration that uses

only three pins.

Figure 3. 512Kbit (64KB) System Configuration with SPI port

Figure 4. System Configuration without SPI port

Rev. 2.0

May 2010

Page 4 of 17

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